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Previous: <a href="GNU-Fortran-and-GCC.html" accesskey="p" rel="prev">GNU Fortran and GCC</a>, Up: <a href="Introduction.html" accesskey="u" rel="up">Introduction</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html" title="Index" rel="index">Index</a>]</p>
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<span id="Standards-1"></span><h3 class="section">1.3 Standards</h3>
<span id="index-Standards"></span>

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<tr><td align="left" valign="top">&bull; <a href="Fortran-95-status.html" accesskey="1">Fortran 95 status</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<tr><td align="left" valign="top">&bull; <a href="Fortran-2003-status.html" accesskey="2">Fortran 2003 status</a></td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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<p>Fortran is developed by the Working Group 5 of Sub-Committee 22 of the
Joint Technical Committee 1 of the International Organization for
Standardization and the International Electrotechnical Commission (IEC).
This group is known as <a href="http://www.nag.co.uk/sc22wg5/">WG5</a>.
Official Fortran standard documents are available for purchase
from ISO; a collection of free documents (typically final drafts) are
also available on the <a href="https://gcc.gnu.org/wiki/GFortranStandards">wiki</a>.
</p>
<p>The GNU Fortran compiler implements ISO/IEC 1539:1997 (Fortran 95).
As such, it can also compile essentially all standard-compliant
Fortran 90 and Fortran 77 programs.  It also supports the ISO/IEC
TR-15581 enhancements to allocatable arrays.
</p>
<p>GNU Fortran also supports almost all of ISO/IEC 1539-1:2004
(Fortran 2003) and ISO/IEC 1539-1:2010 (Fortran 2008).
It has partial support for features introduced in ISO/IEC
1539:2018 (Fortran 2018), the most recent version of the Fortran
language standard, including full support for the Technical Specification
<code>Further Interoperability of Fortran with C</code> (ISO/IEC TS 29113:2012).
More details on support for these standards can be
found in the following sections of the documentation.
</p>
<p>Additionally, the GNU Fortran compilers supports the OpenMP specification
(version 4.5 and partial support of the features of the 5.0 version,
<a href="https://openmp.org/specifications/">https://openmp.org/specifications/</a>).
There also is support for the OpenACC specification (targeting
version 2.6, <a href="https://www.openacc.org/">https://www.openacc.org/</a>).  See
<a href="https://gcc.gnu.org/wiki/OpenACC">https://gcc.gnu.org/wiki/OpenACC</a> for more information.
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